docs: def _parse_value(self, html_data, field):
          """
          Parse the HTML table to find the requested field's value.
  
          All of the values are passed in an HTML table row instead of as
          individual items. The values need to be parsed by matching the
          requested attribute with a parsing scheme that sports-reference uses
          to differentiate stats. This function returns a single value for the
          given attribute.
  
          Parameters
          ----------
          html_data : string
              A string containing all of the rows of stats for a given team. If
              multiple tables are being referenced, this will be comprised of
              multiple rows in a single string.
          field : string
              The name of the attribute to match. Field must be a key in the
              PLAYER_SCHEME dictionary.
  
          Returns
          -------
          list
              A list of all values that match the requested field. If no value
              could be found, returns None.
          """
          scheme = PLAYER_SCHEME[field]
          items = [i.text() for i in html_data(scheme).items()]
          # Stats can be added and removed on a yearly basis. If no stats are
          # found, return None and have that be the value.
          if len(items) == 0:
              return None
          return items